title: Relation of factor V Leiden genotype to risk for acute deep venous thrombosis after joint replacement surgery.
abstract: BACKGROUND
  A point mutation in coagulation factor V (A1691G) is associated with increased risk for venous thrombosis. However, limited information is available about the prospective risk for deep venous thrombosis in specific high-risk clinical settings.
  
  
  OBJECTIVE
  To determine whether the factor V Leiden mutation is associated with an increased occurrence of deep venous thrombosis in patients undergoing hip or knee replacement surgery.
  
  
  METHODS
  Retrospective analysis of plasma samples obtained during six prospective clinical trials that compared different antithrombotic prophylaxis regimens in patients undergoing hip or knee replacement surgery.
  
  
  METHODS
  Inpatients at the University of Rochester Medical Center, McMaster University Medical Center, Hamilton Civic Hospitals, and the Genesee Hospital.
  
  
  METHODS
  825 patients hospitalized for hip or knee replacement surgery.
  
  
  METHODS
  Venographically diagnosed postoperative deep venous thrombosis was correlated with factor V genotype.
  
  
  RESULTS
  The factor V Leiden mutation was not associated with a significantly increased risk for venographically detected deep venous thrombosis. The absolute incidence of deep venous thrombosis was 31% (95% CI, 15% to 47%) in patients with the mutation and 26% (CI, 22% to 29%) in patients without the mutation (relative risk, 1.2 [CI, 0.6 to 2.9]). The factor V Leiden mutation was not significantly associated with deep venous thrombosis in subgroups of patients receiving warfarin or heparin. The incidence of clinical hemorrhage was similar in patients with (10%) and without (8%) the mutation.
  
  
  CONCLUSIONS
  The factor V Leiden mutation is not a significant risk factor for acute deep venous thrombosis in this group of patients. Current data do not justify routine preoperative screening for this mutation or intensified perioperative prophylaxis in patients with the factor V Leiden mutation who are undergoing hip or knee joint replacement surgery and are receiving effective antithrombotic prophylaxis.
authors.affiliation: University of Rochester Medical Center, New York, USA. dryan@eznet.net
authors.forename: D H
authors.initials: DH
authors.lastname: Ryan
authors.forename: M A
authors.initials: MA
authors.lastname: Crowther
authors.forename: J S
authors.initials: JS
authors.lastname: Ginsberg
authors.forename: C W
authors.initials: CW
authors.lastname: Francis
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip; D019645:Arthroplasty, Replacement, Knee; D005165:Factor V / Q000235:genetics*; D005260:Female; D005343:Fibrinolytic Agents / Q000627:therapeutic use; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D010690:Phlebography; D017354:Point Mutation; D011183:Postoperative Complications / Q000209:etiology* / Q000517:prevention & control; D012307:Risk Factors; D013223:Statistics as Topic; D013924:Thrombophlebitis / Q000209:etiology* / Q000517:prevention & control
chemical_list: D005343:Fibrinolytic Agents; D005165:Factor V